One to watch: Without a lot of up-and-comers at the spot, it’s Sterling. He’s making a big jump in role into a crucial spot.

Buck

No. 1: D.J. Wonnum

No. 2: Brad Johnson

Wonnum has emerged as one of USC’s best defensive players. His big question is, can he take a next step to being hyper-productive and perhaps competing for honors in the stacked world of SEC pass rushers. Johnson has added 10-plus pounds since he arrived on campus, and worked his way into the rotation by the end of last season (a tall order considering Wonnum’s presence). The Buck spot is often about trying to fit pieces into the role and seeing how they take, so what comes behind them will have to develop.

One to watch: Johnson, if he can built off the end of last season, and if anyone else finds his way into the group.

One to watch: Louis. If he can be a rotation guy, it gives USC even more flexibility at these spots.

Strongside linebacker

No. 1: Danny Fennell

No. 2: Sherrod Greene

This is an odd position because it’s hardly used in some games and a big factor in others. Fennell got most of the snaps in the bowl game and generally held his own (he was considered a Buck for parts of the start of the season). Greene got his first start at the position and showed promise. Allen-Williams started last season here, so it will likely be in a lot of flux.

One to watch: It's tricky, since the position isn't always part of the defense, but probably Allen-Williams if he can provide a different dimension there.

Nickel

No. 1: Keisean Nixon

No. 2: Jamyest Williams

Will Muschamp moved Nixon inside after spring with the aim of getting more run support from the position. Based on how Nixon played in the bowl, that seems like a good choice. He was slowed by enrolling late, but looked competent. Williams was moved to safety after spring, but this staff hasn’t been shy about dropping safeties to nickel in the past.

One to watch: Nixon, just how he takes to being a real contributor after last season. USC remains perilously unproven at defensive back,so there could be movement depending on who emerges.

One to watch: Roderick. As an early enrollee, he already looked like a college player at 6-foot, 210 pounds. He’s transitioning from playing almost exclusively offense in high school, but Muschamp raved about his instincts and said he will play this season.